package com.atguigu.srb.core.service.impl;

import com.alibaba.excel.EasyExcel;
import com.atguigu.srb.core.listener.ExcelDictDTOListener;
import com.atguigu.srb.core.mapper.DictMapper;
import com.atguigu.srb.core.pojo.dto.ExcelDictDTO;
import com.atguigu.srb.core.pojo.entity.Dict;
import com.atguigu.srb.core.service.DictService;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.exception.ExceptionUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

/**
 * <p>
 * 数据字典 服务实现类
 * </p>
 *
 * @author 桃谷六仙
 * @since 2022-12-14
 */
@Slf4j
@Service
public class DictServiceImpl extends ServiceImpl<DictMapper, Dict> implements DictService {
    @Resource
    private DictMapper dictMapper;
    @Resource//注入redis操作类
    private RedisTemplate redisTemplate;

    @Transactional(rollbackFor = {Exception.class})
    @Override
    public void importData(InputStream inputStream) {
        EasyExcel.read(inputStream, ExcelDictDTO.class,new ExcelDictDTOListener(dictMapper)).sheet().doRead();
        log.info("Excel 导入成功");
    }

    @Override
    public List<ExcelDictDTO> listDictData() {
        List<Dict> dictList= dictMapper.selectList(null);
        //创建excelDto 列表，转换dict数据
        ArrayList<ExcelDictDTO> excelDictDTOS=new ArrayList<>(dictList.size());
        dictList.forEach(dict->{
            ExcelDictDTO excelDictDTO = new ExcelDictDTO();
            BeanUtils.copyProperties(dict,excelDictDTO);
            excelDictDTOS.add(excelDictDTO);
        });
        return excelDictDTOS;
    }

    @Override
    public List<Dict> listByParentId(Long parentId) {
        //首先查询redis中是否存在数据列表
        try {
            List<Dict> dictList=(List<Dict>) redisTemplate.opsForValue().get("srb:core:dictList:"+parentId);
            if(dictList!=null){//如果存在则从redis中直接返回数据列表
                log.info("从redis中获取数据");
                return dictList;
            }
        } catch (Exception e) {
            log.error("redis服务器异常："+ ExceptionUtils.getStackTrace(e));
        }
        //如果不存在则查询数据库
        log.info("从数据库中获取数据");
        QueryWrapper<Dict> dictQueryWrapper = new QueryWrapper<>();
        dictQueryWrapper.eq("parent_id",parentId);
        List<Dict> dictList = baseMapper.selectList(dictQueryWrapper);
        dictList.forEach(dict->{
            boolean hasChildren = this.hasChildren(dict.getId());
            dict.setHasChildren(hasChildren);
        });
        try {
            //把从数据库中查询到的键值对存入 redis中
            log.info("将数据存入redis");
            redisTemplate.opsForValue().set("srb:core:dictList:"+parentId,dictList,5, TimeUnit.MINUTES);
        } catch (Exception e) {
            log.error("redis服务器异常："+ ExceptionUtils.getStackTrace(e));
        }
        return dictList;
    }

    @Override
    public List<Dict> findByDictCode(String dictCode) {
        QueryWrapper<Dict> dictQueryWrapper = new QueryWrapper<>();
        dictQueryWrapper.eq("dict_code",dictCode);
        Dict dict = baseMapper.selectOne(dictQueryWrapper);
        return this.listByParentId(dict.getId());
    }

    @Override
    public String getNameByParentDictCodeAndValue(String dictCode, Integer value) {
        QueryWrapper<Dict> dictQueryWrapper = new QueryWrapper<>();
        dictQueryWrapper.eq("dict_code",dictCode);
        Dict parentDict = baseMapper.selectOne(dictQueryWrapper);
        if(parentDict==null){
            return "";
        }
        dictQueryWrapper=new QueryWrapper<>();
        dictQueryWrapper.eq("parent_id",parentDict.getId())
                .eq("value",value);
        Dict dict=baseMapper.selectOne(dictQueryWrapper);
        if(dict==null){
            return "";
        }

        return dict.getName();
    }

    //判断节点下面是否有子节点
    private boolean hasChildren(Long id){
        QueryWrapper<Dict> dictQueryWrapper = new QueryWrapper<>();
        dictQueryWrapper.eq("parent_id",id);
        Integer count = baseMapper.selectCount(dictQueryWrapper);
        if(count.intValue()>0){
            return true;
        }else{
            return false;
        }
    }
}
